//
// Created by jsjxsy on 2022/7/21.
//

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>

void *thr_fn1(void *arg) {
  printf("thread 1 returning\n");
  return (void *) 1;
}

void *thr_fn2(void *arg) {
  printf("thread 2 exiting\n");
  pthread_exit((void *) 2);
}

void *thr_fn3(void *arg) {
  while (1) {
    printf("thread 3 writing\n");
    sleep(1);
  }
}

int main(void) {
  pthread_t tid;
  void *tret;

  pthread_create(&tid, NULL, thr_fn1, NULL);
  pthread_join(tid, &tret);
  printf("thread 1 exit code %d\n", (int) tret);

  pthread_create(&tid, NULL, thr_fn2, NULL);
  pthread_join(tid, &tret);
  printf("thread 2 exit code %d\n", (int) tret);

  pthread_create(&tid, NULL, thr_fn3, NULL);
  sleep(3);
  pthread_cancel(tid);
  pthread_join(tid, &tret);//tret = PTHREAD_CANCELED
  printf("thread 3 exit code %d\n", (int) tret);

  return 0;
}